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If you want to dig a hole to China, you’re better off starting in South America, according to the site. For example, a hole started in Buenos Aires, Argentina, would end up in Shanghai. If you prefer Beijing, the site suggests starting in Bahia Blanca, Argentina.

The antipode of any point on the Earth’s surface is the point diametrically opposite to it. Essentially, they two points are connected by an imaginary straight line running through the Earth. The site calculates the antipode for any city or zip code entered by converting the latitude and longitude to the opposite hemisphere.

It turns out that most places on land don’t have land-based antipodes, reports the site. And there are no direct commercial flights between antipodal locations.

The creators say they built the site to answer the age-old question and pass on a little geographical knowledge. It has a PayPal button for donations for upkeep and further development.